US1072008A - Safety-stop for elevators. - Google Patents

Description

J. HOPPER.

SAFETY STOP FOR ELEVATORS.

APPLICATION mum AUG.8, 1912.

1,072,008, Patented Sept. 2, 1913.

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J. HOPPER.

SAFETY STOP FOR ELEVATORS. APPLIOATIONVIILED AUG.8,1912.

1,072,008. Patented Sept. 2,1913

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J. HOPPER.

SAFETY STOP FOR ELEVATORS.

APPLICATION FILED AUG.8, 1912.

1,072,008 Patented Sept. 2,1913.

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SAFETY-STOP FOR ELEVATORS.

Specification of Letters Patent.

Patented Sept. 2, t 913.

Application filed August 8; 1912. Serial No. 714,114..

'1 t) MZZ rv/mot it may concern Be it known that I Jonn llonnou, re siding at Fairmont, in the county of Marion and State of lVest Virginia, a citizen of AlistriaJlungary, have invented or discovered certain new and useful Improvements in Safety-Stops for l llevators, of which improvementsthe following is aaspecitication.

My invention relates to the construction of elevators provided with safety devices consisting of cams adapted to engage the elevator guide rails and thereby arrest the descent of the ele 'ator upon the breaking of the sustaining cable.

The object of my invention is to provide a means for operating such safety devices which will be certain and ett'ectiveunder all conditions of service, the elevator at the same time beingsecurely sustained through out its normal operation.

A further object of'my invention is-to so coordinate the action of such safety devices, when used on freight or mine shaft elevators sustained in pairs by a single cable and mm able in opposite directions, that the safety cams of each elevator will, through a single 'instrurnentality, become effective simultaneonsly.

My invention, is illustrated in the accompanying drawings, which form part of my.

specification, and in which- Figure 1 is a front. elevation of a passenger elevator; Fig. 2 is a side elevation of the elevator shown in Fig. 1; Fig. 3 is an enlarged plan view of Fig. 1, showing in detail the construction of the safety device; Fig. l is a sectional view taken on the line lV-lV l ig. 3; Fig. 5 is a sectional view taken on the line V V, Fig. 3; and Fig. (l is an elevation of a pair of freight or mine shaft elevators embodying certain features of my invention.

In the several figures like nmnerals are used to designate like parts.

.teferring particularly to Figs. 1 to 5 of the drawings, the elevator car 1 is suitably arranged to move between guides 2., and is sustained by a supporting cable 3, which passes over a sheave 4t, mounted in suitable framework 5 at the top of the elevator shaft.

As heretofore constriuzted such elevator cars have been provided with safety-cam stopping devices, which have been brought into operation upon the breaking of the sustaining cable by springs or by weights. The Spring-operated safety cams are lmcertain in. their action for the reason that the springs frequently bccomesct and fail to operate inthe case ofan emergency. ()n the other hand no structurally ellicient: means has as yet l)tBGIl ])l'()\'l(l((l 'fOl' using weights to bring the safety-ca1ns into engagement. withthe guide, the elevator car at the same time being securely and properly sustained throughoutits normal operation.

Inthe elevator shown herein, two shafts (3 are-rotatably mounted in the upper por' tion of the-car 1, and to each end of each shaft atoothcdcam or eccentric 7 is rigidly secured; To each shaft (5 I also secure two arms 8, such arms preferably being placed near the ends of the shafts and extending toward the center: of -the car. A pair of leverst) are pivot-ed in suitable supports 10 securcdito the cross beam 11 of the car, and between such. supports l secure straps l2 adaptedto extend over the inner ends of said levers, as shown. The outer ends of the levers 9 are slotted in order to receive the arms-S-whiclrcxtcnd through such slots. At the outer end of each lever t) a rope or cable 13 is attached, eacln rope extending over sheavesl-l-a-nd15, and having a weight. 16 secured to its ot-her end.

In the o cration of this elevator, the weight ofthe car is normally -arricd by the cable 3, which holds the lovers 5) in their bearingpositions upon the straps '12. \Vhen the cable 3 breaks, or for some other reason becomes slack, the weights 16, through the ropes 13, reverse the normal positions of the pivoted levers t), and in this reverse movement the lovers cause the arms 8 of the cam shafts to be raised and thereby bring the cams 7 into engagement with the guides 2. It; will be seen that, in this particular arrangement, a very positive and quick action of the safety cams is assured in case of accident to the supporting cable. l urthermm'e, it will be seen that. during the normal operation of the elevator, the car will be provided with a striu-tm'ally adequate support.

My invention has to do also with a particular arrangement of safety cam operating devices when used on freight or minev shaft elevators, the cars of which are sustaincd in pairs by a common cable, and

which move in opposite directions with rc-- lation to each other through their rcspective shafts. As usually constructed. each elevator car of such pairs 1s provided with independent means for effecting the operation or setting of its safety cams upon the breaking of the common sustaining cable. In order to eliminate one of such operating means and to thereby cheapen the cost of such elevators as well as render them simpler in construction, I coordinate the cam operating means of both elevator cars so that a single instrumentality becomes effective to set their safety cams. My preferred means to this end is illustrated in Fig. 6 of the drawings. The freight elevator cars 18 and 19, as shown therein, are suspended by a common cable 3 which passes over sheaves 4 supported by suitable frames (not shown). The safety cams and their operating means are, in this disclosure, the same as those illustrated in Figs. 1 to 5 and described above. In order to move the levers 9 to their reverse posit-ions, and thereby bring the cams 7 into engagement with the guides 2 when the sustaining cable 3 breaks, I connect the levers 9 of one elevator car to the corresponding levers 9 of the other elevator car by means of ropes or cables 13 and 13, passing over sheaves 14f and 15 at the top of the elevator shafts. The said ropes are preferably so adjusted as to sustain none of the weight of the elevator cars during the normal operation of the cars.

In case the sustaining cable 8 breaks a double safeguard is, by this construction, provided against the falling of the elevator cars. The ropes may be of suflicient strength in themselves to sustain the elevator cars, but their primary function is to set the safety cams in the manner described in connection with Figs. 1 to 5.

I claim as my invention:

1. In an elevator safety stop, the combination with an elevator car movable between guides, of a pair of rotary mounted shafts each provided with safety cams in positions to engage said guides, a sustaining cable, a pair of weighted cables, a pair of pivoted levers each connected at its inner end to said sustaining cable and at its outer) 1 end to one of said weighted cables, arms extending from said cam shafts and operatively engaged by said levers, and a pair of straps extending one over the inner end of each lever and connected to said car.

2. In an elevator safety stop, the com-' over the inner end of each lever and connected to said car.

In testimony whereof I have hereunto set my hand. 7

r 7 JOHN HOFFER.

Witnesses Gum E. Amos, S. W. BAKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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